Problem: The rate constant for this first-order reaction is 0.510 s-1 at 400°C. A → products How long (in seconds) would it take for the concentration of A to decrease from 0.710 M to 0.270 M? 

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The rate constant for this first-order reaction is 0.510 s-1 at 400°C. 

A → products 

How long (in seconds) would it take for the concentration of A to decrease from 0.710 M to 0.270 M? 

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Based on our data, we think this problem is relevant for Professor Zwier & Roadruck's class at PURDUE.